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arXiv · 2303.17871

Zero-point entropies of spin-jam and spin-glass states in a frustrated magnet

Chairote Piyakulworawat·Asiri Thennakoon·Junjie Yang·Hideki Yoshizawa·Daichi Ueta·Taku J Sato·Kuan Sheng·Wei-Tin Chen·Woei-Wu Pai·Kittiwit Matan·Seung-Hun Lee
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Abstract

Thermodynamics studies of a prototypical quasi-two-dimensional frustrated magnet Ba$_2$Sn$_2$ZnCr$_{7p}$Ga$_{10-7p}$O$_{22}$ where the magnetic Cr$^{3+}$ ions are arranged in a triangular network of bipyramids show that the magnetic zero-point entropy for $p=0.98$ is 55(1)\% of the entropy expected when the Cr$^{3+}$ moments are fully disordered. Furthermore, when combined with a previous neutron scattering study and the perimeter scaling entropy of a spin jam, the analysis reveals that with decreasing $p$, i.e., doping of the nonmagnetic Ga$^{3+}$ ions, the variation in the magnetic zero-point entropy can be well explained by the combined effects of the zero-point entropy of the spin jam state and that of weakly coupled orphan spins, shedding light on the coexistence of the two types of spin states in quantum magnetism.

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Chairote Piyakulworawat, Asiri Thennakoon, Junjie Yang, Hideki Yoshizawa, Daichi Ueta, Taku J Sato, Kuan Sheng, Wei-Tin Chen, Woei-Wu Pai, Kittiwit Matan, Seung-Hun Lee. 2023-03-31. Zero-point entropies of spin-jam and spin-glass states in a frustrated magnet. https://doi.org/10.1103/physrevb.109.104420

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